Lee-Yang退相干通道下的自旋压缩与共生纠缠
Spin squeezing and concurrence under Lee-Yang dephasing channels
AI总结：
本文研究两类Lee-Yang退相干通道下的自旋压缩与共生纠缠，发现独立浴可增强自旋压缩，而共同浴不能，但二者共生纠缠性质相近，并与Lee-Yang零点对应。
摘要：
Lee-Yang零点与耦合到多体系统的探测自旋相干性中的零点存在一一映射关系。本文研究两类不同Lee-Yang退相干通道下的自旋压缩，在这些通道中配分函数在Lee-Yang零点处消失。在第一类通道中，各探测自旋耦合到其自身的浴，我们发现自旋压缩性能得到增强，且其最大值仅依赖于初始态。此外，所有共生纠缠消失区域的中心均对应于Lee-Yang零点。在第二类通道中，各探测自旋共同耦合到同一个浴，自旋压缩性能并未增强；然而，两类通道下的共生纠缠具有几乎相同的性质。这些结果为多体物理提供了新的实验可能性，并拓展了关于探测-浴系统中纠缠与自旋压缩之间关系的新视角。
英文摘要：
The Lee-Yang zeros are one-to-one mapping to zeros in the coherence of a probe spin coupled to a many-body system. Here, we study the spin squeezing under two different types of Lee-Yang dephasing channels in which the partition functions vanish at Lee-Yang zeros. Under the first type of the channels in which probes are coupled to their own bath, we find that the performance of spin squeezing is improved and its maximum only depends on the initial state. Moreover, the centers of all the concurrence vanishing domains are corresponding to the Lee-Yang zeros. Under the second type of the channels in which probes are coupled to one bath together, the performance of spin squeezing is not improved, however, the concurrence shares almost the same properties under both channels. These results provide new experimental possibilities in many-body physics and extend a new perspective of the relationship between the entanglement and spin squeezing in probes-bath systems.
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